"After just buying a Scott carbon 930 MTB 29er I had the same question.
After extensive research, buying tyres, having received the wrong product from a bike shop and reading this post I had to respond. Clearly no one really knows!
"I've been converting some old tyres that originally came on bikes with tubes to tubeless, they have all been pre stretched. I didn't have much luck with already stretched maxxis crossmarks, but i've been putting my stretched…"